
B–61863E/15
6. LADDER DIAGRAM MONITOR
AND EDITOR
PMC–NB6 MANIPULATION
751
Error message Meaning and solution
NO INPUT FOR
OPERATION
Meaning:
No signal is provided for logical operation.
Solution:
Coil without input, or coil connected to output of func-
tional instruction that has no output, causes this error.
If coil is not necessary, remove it. If necessary,
connect it to meaningful input.
OPERATION AF-
TER FUNCTION
IS FORBIDDEN
Meaning:
No logical operation with functional instruction output
is permitted, except write coils.
Solution:
Output of functional instruction can not be connected
to a contact, nor to conjunction with other signal that
will be implemented by logical–or operation.
PARAMETER IS
NOT SUPPLIED
Meaning:
Relay with blank address, or blank parameter of func-
tional instruction, is found.
Solution:
Enter all of the relay addresses, and parameters of
functional instructions.
SHORT CIRCUIT
Meaning:
Some contacts are connected with short circuit.
Solution:
Find contact with terminals connected by short circuit,
and correct connections.
TOO LARGE NET
Meaning:
A net is too large. When the net is converted to an
object, the number of steps exceeds 256.
Solution:
Locate a net portion that can be divided into smaller,
multiple nets. Then, divide the net so as to reduce the
number of steps per net.
TOO MANY
FUNCTIONS IN
NET
Meaning:
Too many functional instructions are in one net.
Solution:
Only one functional instruction is allowed to constitute
a net. If necessary, divide the net into plural nets.
WRITE COIL EX-
PECTED
Meaning:
Write coil is expected, but not found.
Solution:
Add proper write coil to the net.